.canvas-page {
  box-sizing: border-box;
  display: flex;
  height: 100%;
  padding: 0 4px 12px;
  flex-direction: column;

  .canvas-page-header {
    flex-shrink: 0;
  }

  .canvas-page-content {
    flex: 1;
    overflow: hidden;
  }

  .canvas-page-row {
    display: flex;
    align-items: stretch;
    
    .page-row-left {
      width: 310px;
      margin-right: 18px;
      flex-shrink: 0;
    }

    .page-row-center {
      flex: 1;
      overflow: hidden;
    }

    .page-row-right {
      width: 340px;
      margin-left: 18px;
      flex-shrink: 0;
    }
  }
}
